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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
4ff28d4c DM |
2 | /* Glue code for SHA1 hashing optimized for sparc64 crypto opcodes. |
3 | * | |
4 | * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c | |
5 | * | |
6 | * Copyright (c) Alan Smithee. | |
7 | * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> | |
8 | * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> | |
9 | * Copyright (c) Mathias Krause <minipli@googlemail.com> | |
10 | */ | |
11 | ||
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
13 | ||
14 | #include <crypto/internal/hash.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/cryptohash.h> | |
19 | #include <linux/types.h> | |
20 | #include <crypto/sha.h> | |
21 | ||
22 | #include <asm/pstate.h> | |
23 | #include <asm/elf.h> | |
24 | ||
10803624 DM |
25 | #include "opcodes.h" |
26 | ||
4ff28d4c DM |
27 | asmlinkage void sha1_sparc64_transform(u32 *digest, const char *data, |
28 | unsigned int rounds); | |
29 | ||
30 | static int sha1_sparc64_init(struct shash_desc *desc) | |
31 | { | |
32 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
33 | ||
34 | *sctx = (struct sha1_state){ | |
35 | .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 }, | |
36 | }; | |
37 | ||
38 | return 0; | |
39 | } | |
40 | ||
41 | static void __sha1_sparc64_update(struct sha1_state *sctx, const u8 *data, | |
42 | unsigned int len, unsigned int partial) | |
43 | { | |
44 | unsigned int done = 0; | |
45 | ||
46 | sctx->count += len; | |
47 | if (partial) { | |
48 | done = SHA1_BLOCK_SIZE - partial; | |
49 | memcpy(sctx->buffer + partial, data, done); | |
50 | sha1_sparc64_transform(sctx->state, sctx->buffer, 1); | |
51 | } | |
52 | if (len - done >= SHA1_BLOCK_SIZE) { | |
53 | const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE; | |
54 | ||
55 | sha1_sparc64_transform(sctx->state, data + done, rounds); | |
56 | done += rounds * SHA1_BLOCK_SIZE; | |
57 | } | |
58 | ||
59 | memcpy(sctx->buffer, data + done, len - done); | |
60 | } | |
61 | ||
62 | static int sha1_sparc64_update(struct shash_desc *desc, const u8 *data, | |
63 | unsigned int len) | |
64 | { | |
65 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
66 | unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; | |
67 | ||
68 | /* Handle the fast case right here */ | |
69 | if (partial + len < SHA1_BLOCK_SIZE) { | |
70 | sctx->count += len; | |
71 | memcpy(sctx->buffer + partial, data, len); | |
72 | } else | |
73 | __sha1_sparc64_update(sctx, data, len, partial); | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | /* Add padding and return the message digest. */ | |
79 | static int sha1_sparc64_final(struct shash_desc *desc, u8 *out) | |
80 | { | |
81 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
82 | unsigned int i, index, padlen; | |
83 | __be32 *dst = (__be32 *)out; | |
84 | __be64 bits; | |
85 | static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, }; | |
86 | ||
87 | bits = cpu_to_be64(sctx->count << 3); | |
88 | ||
89 | /* Pad out to 56 mod 64 and append length */ | |
90 | index = sctx->count % SHA1_BLOCK_SIZE; | |
91 | padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index); | |
92 | ||
93 | /* We need to fill a whole block for __sha1_sparc64_update() */ | |
94 | if (padlen <= 56) { | |
95 | sctx->count += padlen; | |
96 | memcpy(sctx->buffer + index, padding, padlen); | |
97 | } else { | |
98 | __sha1_sparc64_update(sctx, padding, padlen, index); | |
99 | } | |
100 | __sha1_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56); | |
101 | ||
102 | /* Store state in digest */ | |
103 | for (i = 0; i < 5; i++) | |
104 | dst[i] = cpu_to_be32(sctx->state[i]); | |
105 | ||
106 | /* Wipe context */ | |
107 | memset(sctx, 0, sizeof(*sctx)); | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
112 | static int sha1_sparc64_export(struct shash_desc *desc, void *out) | |
113 | { | |
114 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
115 | ||
116 | memcpy(out, sctx, sizeof(*sctx)); | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | static int sha1_sparc64_import(struct shash_desc *desc, const void *in) | |
122 | { | |
123 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
124 | ||
125 | memcpy(sctx, in, sizeof(*sctx)); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static struct shash_alg alg = { | |
131 | .digestsize = SHA1_DIGEST_SIZE, | |
132 | .init = sha1_sparc64_init, | |
133 | .update = sha1_sparc64_update, | |
134 | .final = sha1_sparc64_final, | |
135 | .export = sha1_sparc64_export, | |
136 | .import = sha1_sparc64_import, | |
137 | .descsize = sizeof(struct sha1_state), | |
138 | .statesize = sizeof(struct sha1_state), | |
139 | .base = { | |
140 | .cra_name = "sha1", | |
141 | .cra_driver_name= "sha1-sparc64", | |
10803624 | 142 | .cra_priority = SPARC_CR_OPCODE_PRIORITY, |
4ff28d4c DM |
143 | .cra_blocksize = SHA1_BLOCK_SIZE, |
144 | .cra_module = THIS_MODULE, | |
145 | } | |
146 | }; | |
147 | ||
148 | static bool __init sparc64_has_sha1_opcode(void) | |
149 | { | |
150 | unsigned long cfr; | |
151 | ||
152 | if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) | |
153 | return false; | |
154 | ||
155 | __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); | |
156 | if (!(cfr & CFR_SHA1)) | |
157 | return false; | |
158 | ||
159 | return true; | |
160 | } | |
161 | ||
162 | static int __init sha1_sparc64_mod_init(void) | |
163 | { | |
164 | if (sparc64_has_sha1_opcode()) { | |
165 | pr_info("Using sparc64 sha1 opcode optimized SHA-1 implementation\n"); | |
166 | return crypto_register_shash(&alg); | |
167 | } | |
168 | pr_info("sparc64 sha1 opcode not available.\n"); | |
169 | return -ENODEV; | |
170 | } | |
171 | ||
172 | static void __exit sha1_sparc64_mod_fini(void) | |
173 | { | |
174 | crypto_unregister_shash(&alg); | |
175 | } | |
176 | ||
177 | module_init(sha1_sparc64_mod_init); | |
178 | module_exit(sha1_sparc64_mod_fini); | |
179 | ||
180 | MODULE_LICENSE("GPL"); | |
181 | MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, sparc64 sha1 opcode accelerated"); | |
182 | ||
5d26a105 | 183 | MODULE_ALIAS_CRYPTO("sha1"); |
226f7cea DM |
184 | |
185 | #include "crop_devid.c" |